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Sulfur/TAN Ratio Effect on Iron Sulfide (FeS) Scale Properties Challenged in Continuous Oil Flow

Naphthenic acids and sulfur compounds are important corrosive species contained in low quality crudes and can cause significant equipment damages when such crudes are processed. Although the two corrosive species have a synergistic effect at high temperatures their corrosion products can influence the extent of the damage. Thus the iron sulfide (FeS) scales formed as sulfur reacts with iron can hinder the NAP acid diffusion to the metal limiting their corrosive effect. The FeS scales properties are influenced by different factors such as the types of sulfur compounds in oil (sulfides disulfides mercaptans thiophenes) NAP acids interactions temperature flow conditions - all factors that are difficult to control. This experimental work intended to evaluate the properties of FeS scales formed from model sulfur compounds (sulfides and mercaptans) in interaction with NAP acids using the “pretreatment – challenge” test protocol. According to this protocol FeS scales were formed on metal samples from mercaptans/mercaptans and sulfides on different ratios/concentrations in the presence of NAP acids at high temperature.Further preformed scales were exposed to a constant NAP acid attack under high temperature and continuous flow conditions. Samples metal losses and scale SEM/EDS analysis were used to characterize the protective properties of FeS scales.Keywords: sulfur model compounds naphthenic acid corrosion high temperature

Product Number: 51319-13490-SG
Author: Gheorghe Bota
Publication Date: 2019
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